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Surface charge and adsorption properties of polyethylene in aqueous solutions of inorganic electrolytes

I. Streaming potential measurement

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Summary

The streaming potentials of several sorts of polyethylene were determined as a function of pH and composition of aqueous solutions and the electrokinetic (zeta) potentials were calculated. The results were compared with the electrokinetic properties of glass and polystyrene. It has been found that H+ and OH− ions are potential-determining on polyethylene. The surface of polyethylene is charged negatively above pH 2.5, probably due to dissociation of carboxyl groups, contained on polyethylene as a result of its oxidation during its polymerization and/or further processing. The zeta potentials depend in a rather complicated way on the concentration of various 1∶1 inorganic electrolytes. The probable interpretation of this dependence has been given and conclusion was derived about the absence of compact adhered layer of water molecules at the surface of polyethylene. The results of the present work may be of some importance for elucidating the adsorption properties of polyethylene.

Zusammenfassung

Die Strömungspotentiale verschiedener Arten von Polyäthylen wurden als Funktion des pH-Wertes und der Zusammensetzung wäßriger Lösungen bestimmt und aus diesen die elektrokinetischen Potentiale (Zeta) berechnet. Die Ergebnisse wurden mit den elektrokinetischen Eigenschaften von Glas und Polystyrol verglichen. Es zeigt sich, daß H+- und OH−-Ionen auf Polyäthylen potentialbestimmend sind. Die Oberfläche des Polyäthylen ist oberhalb pH 2,5 negativ geladen, vermutlich entsprechend der Dissoziation von Carboxylgruppen, die als Ergebnis der Oxydation während der Polymerisation und/oder weiterer Verarbeitungsprozesse im Polyäthylen enthalten sind. Die Zeta-Potentiale hängen in ziemlich komplizierter Weise von der Konzentration verschiedener ein-einwertiger anorganischer Elektrolyte ab. Die wahrscheinlichste Interpretation dieser Abhängigkeit wurde gegeben und Schlüsse über die Abwesenheit kompakter adsorbierter Schichten von Wassermolekülen auf der Oberfläche des Polyäthylens gezogen.

Die Ergebnisse der vorliegenden Arbeit mögen von einiger Bedeutung für die Erkenntnisse der Adsorptionseigenschaften von Polyäthylen sein.

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Author notes

  1. P. Beneš & M. Paulenová

    Present address: Department of Nuclear Chemistry, Technical University of Prague, Prague, Czechoslovakia

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    1. P. Beneš
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    2. M. Paulenová
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    Additional information

    The authors are indebted to Dr.P. Skřivan for helpful discussion of the streaming potential method and to Dr.J. Hradil for kindly supplying the polyethylene samples.

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    Beneš, P., Paulenová, M. Surface charge and adsorption properties of polyethylene in aqueous solutions of inorganic electrolytes. Kolloid-Z.u.Z.Polymere 251, 766–771 (1973). https://doi.org/10.1007/BF01499104

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